My group 29 12 volt had one bad cell after 2 1/4 years. I switched to Us Battery after finding that Trojan moved production to Mexico and Saudi Arabia. I took the opportunity to switch to two 6 volts. Test the specific gravity to check the battery health.

Where did you get that information?
Trojan site says they have plants in Georgia and that they are US made ( glass mat anyway ).
Trojan works for me and their web-site is a wealth of information.

I didn't think I could pay Glens' toll so went out to Canadian Tire to buy a hydrometer and ended going back there again when I discovered the thing inside was broken. (Must remember to bring glasses with me when shopping!) So...I have done precisely nothing on it yet. Better luck tomorrow.

I switched to Us Battery after finding that Trojan moved production to Mexico and Saudi Arabia.

If the reason for switching is wanting to economically support your own region, I understand that. If the reason is an assumption that quality would be inferior if made outside of the United States, I think a reality check is in order - quality depends on how products are made, not where they are made. In electronics, for instance, both the best and the worst both come from China... made to different standards at different costs.

Ours pooped out at 3 years and only 20 weeks of camping and about 15 weeks of that off grid .
Mind you there was almost 30,000 k of travel over this time . Rough roads do have a effect on battery life . Factory replacement cost 300$ for the pair of 6s . They don't last for ever but it would be nice if they did . I've considered jell cells but haven't checked if there available in 6Vs.
The only ones I've seen where 12 Vs . I hear there more road durable .

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I've almost been everywhere man.
Almost been everywhere.....